Calculate engine crankshaft angular acceleration based on original flywheel data

This paper presented a new method to obtain crankshaft angular acceleration using MATLAB. The original flywheel data was processed through a self-developed MATLAB code to generate crankshaft angular velocity which was differentiated to generate crankshaft angular acceleration. High frequency components in angular acceleration were eliminated through a zero-phase IIR low pass filter. The angular acceleration obtained using MATLAB code was compared with those from commercially available hardware and software and the difference was small. This proves that the MATLAB code is useful. This builds the foundation to evaluate and improve the engine combustion stability with the crankshaft angular acceleration.